You'll often take opposing sides on achieving any goal or moving forward into the future, and this could create some tension between you. You're the dreamer, but your friend's overly serious, even pessimistic outlook will have a dampening effect on your creative spirit. Part of the problem will be that you'll represent things to each other that each of you lacks: Your friend lacks your optimistic outlook and your ability to seize opportunities, and you lack their focus and dedication to hard work.
If you could figure out how to blend your individual strengths, then you'd really get somewhere as a team. Instead of looking at your buddy as being limited and overly focused on responsibility, look on those qualities as strengths. And what looks to them like carelessness on your part is actually an unquenchable spirit, an optimistic streak a mile wide. Change the way you look at each other and you'll stand a greater chance of blending your strengths.